syntactical analyst done

example.graph

@@ -9,14 +9,15 @@ SCREEN {
     FPS: 60,
 }
 
-R = 7;
+const R = 7;
-r = 4;
+const r = 4;
-d = 1;
+const d = 1;
 
-s = 0;
+const s = 0;
-e = 8*π;
+const e = 8*pi;
+const m = cos(π/32);
 
-ANIM offset {R:s <= x <= e,S:π/128}
+ANIM offset {R:s <= x <= e,S:π/128,D:INCREASE}
 
 GRAPH {
     X: (R - r) * cos(t) + d * cos(((R - r) / r) * t),

readme.md

@@ -25,7 +25,7 @@ ID_Start ::= <Any latin alphabet ligature: "A"-"Z", "a"-"z">
 Keywords are not case sensitive.
 
 ```
-screen  graph   anim    img
+screen  graph   anim    const
 sum     pi      alpha   beta
 theta   inf     product integral
 ```
@@ -86,7 +86,7 @@ A `file` can contain any number of the following elements:
 - *Screen*
 - *Graph*
 - *Animation*
-- *Statement*
+- *Constant*
 <!-- - *Image* -->
 
 ### Screen
@@ -148,6 +148,7 @@ Listed bellow are the possible parameters.
 - Possible Values: Natural Numbers, `Unset`
 - Note:
     Centered on zero if `right` and `left` are unset.
+    The range uses `right` or `left` if one is set.
     Has no affect if `right` and `left` are set.
 
 **Height**
@@ -160,6 +161,7 @@ Listed bellow are the possible parameters.
 - Possible Values: Natural Numbers, `Unset`
 - Note:
     Centered on zero if `top` and `bottom` are unset.
+    The range uses `top` or `bottom` if one is set.
     Has no affect if `top` and `bottom` are set.
 
 **Width Scale**
@@ -173,7 +175,7 @@ Listed bellow are the possible parameters.
 - Possible Values: Positive Real Numbers
 - Note:
     Centered on zero if `right` and `left` are unset.
-    Has no affect if `right` and `left` are set or if `width` are set.
+    Has no affect if `right` and `left` are set or if `width` is set.
 
 **Height Scale**
 - Role:
@@ -186,7 +188,7 @@ Listed bellow are the possible parameters.
 - Possible Values: Positive Real Numbers
 - Note:
     Centered on zero if `top` and `bottom` are unset.
-    Has no affect if `top` and `bottom` are set or if `height` are set.
+    Has no affect if `top` and `bottom` are set or if `height` is set.
 
 **FPS**
 - Role:
@@ -246,9 +248,10 @@ If only alpha is set the default color space is **Grey-scale**.
 Listed bellow are the available color spaces and their subscripts.
 Default value in parenthesis for the unused subscripts of the color spaces.
 
-- **Grey-scale**: `wa` - Grey-scale (1), Alpha (1)
+- **Grey-scale**: `w`, `a` - Grey-scale (1), Alpha (1)
-- **RGB**: `rgba` -  Red (0), Green (0), Blue (0), Alpha (1)
+- **RGB**: `r`, `g`, `b`, `a` -  Red (0), Green (0), Blue (0), Alpha (1)
-- **HSL**: `hsla` -  Hue (0), Saturation (1), Luminosity (0.5), Alpha (1)
+- **HSL**: `h`, `s`, `l`, `a` -  Hue (0), Saturation (1), Luminosity (0.5),
+Alpha (1)
 
 All values can be a real number between 0 and 1 inclusive.
 Values bellow this range will be interpreted as 0.
@@ -284,6 +287,12 @@ is `π/32`.
 - `decrease`
 - `bounce`
 
+#### Constant
+
+A *constant* begins with the `const` keyword. It then is followed by an
+identifier, the assignment operator (`=`) followed by an `expression` then
+ended with a semicolon (`;`).
+
 ### Expressions
 
 
@@ -329,6 +338,8 @@ Here are all operators and their types and names in order of precedence.
 | `+` | Binary | Addition *Operator* |
 | `=` | Binary | Assignment *Operator* |
 
+**Note**: The assignment operator (`=`) can only be used in a *Constant*
+
 #### Literal
 
 A `literal` is just simply the content of the literal.
@@ -337,10 +348,6 @@ A `literal` is just simply the content of the literal.
 
 A `identifier` is just simply the name of the identifier.
 
-#### Statement
-
-A `statement` is made up of an `expression` followed by a semicolon (`;`).
-
 ## Semantics
 
 ### Screen Block

syntax.txt

@@ -0,0 +1,101 @@
+File
+├─ Screen
+│ ├─ Width Scale: 100
+│ ├─ Height Scale: 100
+│ └─ FPS: 60
+├─ Constant (R)
+│ └─ Literal Expression (7)
+├─ Constant (r)
+│ └─ Literal Expression (4)
+├─ Constant (d)
+│ └─ Literal Expression (1)
+├─ Constant (s)
+│ └─ Literal Expression (0)
+├─ Constant (e)
+│ └─ Binary Expression (BinaryOperator.Multiplication)
+│   ├─ Literal Expression (8)
+│   └─ Literal Expression (π)
+├─ Constant (m)
+│ └─ Function Call (cos)
+│   └─ Binary Expression (BinaryOperator.Division)
+│     ├─ Literal Expression (π)
+│     └─ Literal Expression (32)
+├─ Animation (offset)
+│ ├─ Range Start (≤)
+│ │ └─ Literal Expression (s)
+│ ├─ Range End (≤)
+│ │ └─ Literal Expression (e)
+│ ├─ Step
+│ │ └─ Binary Expression (BinaryOperator.Division)
+│ │   ├─ Literal Expression (π)
+│ │   └─ Literal Expression (128)
+│ └─ Direction: AnimationDirection.Increase
+└─ Graph
+  ├─ X
+  │ └─ Binary Expression (BinaryOperator.Addition)
+  │   ├─ Binary Expression (BinaryOperator.Multiplication)
+  │   │ ├─ Enclosed Expression
+  │   │ │ └─ Binary Expression (BinaryOperator.Subtraction)
+  │   │ │   ├─ Literal Expression (R)
+  │   │ │   └─ Literal Expression (r)
+  │   │ └─ Function Call (cos)
+  │   │   └─ Literal Expression (t)
+  │   └─ Binary Expression (BinaryOperator.Multiplication)
+  │     ├─ Literal Expression (d)
+  │     └─ Function Call (cos)
+  │       └─ Binary Expression (BinaryOperator.Multiplication)
+  │         ├─ Enclosed Expression
+  │         │ └─ Binary Expression (BinaryOperator.Division)
+  │         │   ├─ Enclosed Expression
+  │         │   │ └─ Binary Expression (BinaryOperator.Subtraction)
+  │         │   │   ├─ Literal Expression (R)
+  │         │   │   └─ Literal Expression (r)
+  │         │   └─ Literal Expression (r)
+  │         └─ Literal Expression (t)
+  ├─ Y
+  │ └─ Binary Expression (BinaryOperator.Subtraction)
+  │   ├─ Binary Expression (BinaryOperator.Multiplication)
+  │   │ ├─ Enclosed Expression
+  │   │ │ └─ Binary Expression (BinaryOperator.Subtraction)
+  │   │ │   ├─ Literal Expression (R)
+  │   │ │   └─ Literal Expression (r)
+  │   │ └─ Function Call (sin)
+  │   │   └─ Literal Expression (t)
+  │   └─ Binary Expression (BinaryOperator.Multiplication)
+  │     ├─ Literal Expression (d)
+  │     └─ Function Call (sin)
+  │       └─ Binary Expression (BinaryOperator.Multiplication)
+  │         ├─ Enclosed Expression
+  │         │ └─ Binary Expression (BinaryOperator.Division)
+  │         │   ├─ Enclosed Expression
+  │         │   │ └─ Binary Expression (BinaryOperator.Subtraction)
+  │         │   │   ├─ Literal Expression (R)
+  │         │   │   └─ Literal Expression (r)
+  │         │   └─ Literal Expression (r)
+  │         └─ Literal Expression (t)
+  ├─ T
+  │ └─ Inline Animation
+  │   ├─ Range Start (≤)
+  │   │ └─ Binary Expression (BinaryOperator.Addition)
+  │   │   ├─ Literal Expression (s)
+  │   │   └─ Literal Expression (offset)
+  │   ├─ Range End (≤)
+  │   │ └─ Binary Expression (BinaryOperator.Addition)
+  │   │   ├─ Literal Expression (e)
+  │   │   └─ Literal Expression (offset)
+  │   ├─ Step
+  │   │ └─ Binary Expression (BinaryOperator.Division)
+  │   │   ├─ Literal Expression (π)
+  │   │   └─ Literal Expression (32)
+  │   └─ Direction: AnimationDirection.Increase
+  └─ C_w
+    └─ Enclosed Expression
+      └─ Binary Expression (BinaryOperator.Division)
+        ├─ Enclosed Expression
+        │ └─ Binary Expression (BinaryOperator.Subtraction)
+        │   ├─ Literal Expression (t)
+        │   └─ Literal Expression (s)
+        └─ Enclosed Expression
+          └─ Binary Expression (BinaryOperator.Subtraction)
+            ├─ Literal Expression (e)
+            └─ Literal Expression (s)

tokens.txt

@@ -1,4 +1,4 @@
-Type: Identifier, Value: SCREEN
+Type: Keyword, Value: SCREEN
 Type: Punctuation, Value: {
 Type: Identifier, Value: Width
 Type: Identifier, Value: Scale
@@ -15,38 +15,65 @@ Type: Punctuation, Value: :
 Type: NumberLiteral, Value: 60
 Type: Punctuation, Value: ,
 Type: Punctuation, Value: }
+Type: Keyword, Value: const
 Type: Identifier, Value: R
 Type: Punctuation, Value: =
 Type: NumberLiteral, Value: 7
 Type: Punctuation, Value: ;
+Type: Keyword, Value: const
 Type: Identifier, Value: r
 Type: Punctuation, Value: =
 Type: NumberLiteral, Value: 4
 Type: Punctuation, Value: ;
+Type: Keyword, Value: const
 Type: Identifier, Value: d
 Type: Punctuation, Value: =
 Type: NumberLiteral, Value: 1
 Type: Punctuation, Value: ;
-Type: Identifier, Value: ANIM
+Type: Keyword, Value: const
+Type: Identifier, Value: s
+Type: Punctuation, Value: =
+Type: NumberLiteral, Value: 0
+Type: Punctuation, Value: ;
+Type: Keyword, Value: const
+Type: Identifier, Value: e
+Type: Punctuation, Value: =
+Type: NumberLiteral, Value: 8
+Type: Punctuation, Value: *
+Type: Punctuation, Value: π
+Type: Punctuation, Value: ;
+Type: Keyword, Value: const
+Type: Identifier, Value: m
+Type: Punctuation, Value: =
+Type: Identifier, Value: cos
+Type: Punctuation, Value: (
+Type: Punctuation, Value: π
+Type: Punctuation, Value: /
+Type: NumberLiteral, Value: 32
+Type: Punctuation, Value: )
+Type: Punctuation, Value: ;
+Type: Keyword, Value: ANIM
 Type: Identifier, Value: offset
 Type: Punctuation, Value: {
 Type: Identifier, Value: R
 Type: Punctuation, Value: :
-Type: NumberLiteral, Value: 0
+Type: Identifier, Value: s
 Type: Punctuation, Value: ≤
 Type: Identifier, Value: x
 Type: Punctuation, Value: ≤
-Type: NumberLiteral, Value: 8
+Type: Identifier, Value: e
-Type: Punctuation, Value: *
-Type: Punctuation, Value: π
 Type: Punctuation, Value: ,
 Type: Identifier, Value: S
 Type: Punctuation, Value: :
 Type: Punctuation, Value: π
 Type: Punctuation, Value: /
 Type: NumberLiteral, Value: 128
+Type: Punctuation, Value: ,
+Type: Identifier, Value: D
+Type: Punctuation, Value: :
+Type: Identifier, Value: INCREASE
 Type: Punctuation, Value: }
-Type: Identifier, Value: GRAPH
+Type: Keyword, Value: GRAPH
 Type: Punctuation, Value: {
 Type: Identifier, Value: X
 Type: Punctuation, Value: :
@@ -110,19 +137,17 @@ Type: Punctuation, Value: )
 Type: Punctuation, Value: ,
 Type: Identifier, Value: T
 Type: Punctuation, Value: :
-Type: Identifier, Value: ANIM
+Type: Keyword, Value: ANIM
 Type: Punctuation, Value: {
 Type: Identifier, Value: R
 Type: Punctuation, Value: :
-Type: NumberLiteral, Value: 0
+Type: Identifier, Value: s
 Type: Punctuation, Value: +
 Type: Identifier, Value: offset
 Type: Punctuation, Value: ≤
 Type: Identifier, Value: x
 Type: Punctuation, Value: ≤
-Type: NumberLiteral, Value: 8
+Type: Identifier, Value: e
-Type: Punctuation, Value: *
-Type: Punctuation, Value: π
 Type: Punctuation, Value: +
 Type: Identifier, Value: offset
 Type: Punctuation, Value: ,
@@ -141,22 +166,13 @@ Type: Punctuation, Value: (
 Type: Punctuation, Value: (
 Type: Identifier, Value: t
 Type: Punctuation, Value: -
-Type: Identifier, Value: r
+Type: Identifier, Value: s
-Type: Punctuation, Value: [
-Type: NumberLiteral, Value: 0
-Type: Punctuation, Value: ]
 Type: Punctuation, Value: )
 Type: Punctuation, Value: /
 Type: Punctuation, Value: (
-Type: Identifier, Value: r
+Type: Identifier, Value: e
-Type: Punctuation, Value: [
-Type: NumberLiteral, Value: 1
-Type: Punctuation, Value: ]
 Type: Punctuation, Value: -
-Type: Identifier, Value: r
+Type: Identifier, Value: s
-Type: Punctuation, Value: [
-Type: NumberLiteral, Value: 0
-Type: Punctuation, Value: ]
 Type: Punctuation, Value: )
 Type: Punctuation, Value: )
 Type: Punctuation, Value: }